Nyaaori/rockbox
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
rockbox/firmware/target/coldfire/iriver/lcd-remote-as-iriver.S

321 lines
8.4 KiB
ArmAsm
Raw Normal View History

Iriver remote LCD driver: * Split out assembler parts. * Reintroduced the 2 transfer routine variants (low/high CPU clock), and made the version for high CPU clock a little slower because there were problems reported. The function can be slowed down more if there are still problems. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17006 a1c6a512-1295-4272-9138-f99709370657
2008-04-06 23:57:37 +00:00
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Jens Arnold
*
Updated our source code header to explicitly mention that we are GPL v2 or later. We still need to hunt down snippets used that are not. 1324 modified files... http://www.rockbox.org/mail/archive/rockbox-dev-archive-2008-06/0060.shtml git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17847 a1c6a512-1295-4272-9138-f99709370657
2008-06-28 18:10:04 +00:00
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
Iriver remote LCD driver: * Split out assembler parts. * Reintroduced the 2 transfer routine variants (low/high CPU clock), and made the version for high CPU clock a little slower because there were problems reported. The function can be slowed down more if there are still problems. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17006 a1c6a512-1295-4272-9138-f99709370657
2008-04-06 23:57:37 +00:00
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#define RS_MASK 0x00010000
#define CLOCK_MASK 0x10000000
#define GPIO_OUT_ADDR 0x80000004
#define CS_MASK 0x00000004 /* used in moveq.l */
#define DATA_MASK 0x00040000
#define GPIO1_OUT_ADDR 0x800000b4
#define CS_TIMEOUT 10 /* HZ/10 */
.extern cpu_frequency /* Global variable from system.c */
.extern remote_byte_delay /* Global variable from lcd-remote-iriver.c */
.extern remote_cs_countdown /* Global variable from lcd-remote-iriver.c */
.section .icode,"ax",@progbits
/* Output 8 bits to the LCD. Instruction order is devised to maximize the
* delay between changing the data line and the CLK L->H transition, which
* makes the LCD controller sample DATA.
* Requires CLK = 0 on entry.
*
* Custom calling convention:
* %a0 - GPIO_OUT_ADDR
* %a1 - GPIO1_OUT_ADDR
* %d4 - data byte
* %d6 - DATA_MASK
* Clobbers:
* %d0..%d4
*/
#ifdef HAVE_REMOTE_LCD_TICKING
.write_byte_delayed:
move.l remote_byte_delay, %d0
1:
subq.l #1, %d0
bne.s 1b
#endif
.write_byte:
move.w %sr, %d3 /* Get current interrupt level */
move.w #0x2700, %sr /* Disable interrupts */
move.l (%a1), %d0 /* Get current state of data port */
move.l %d0, %d1
and.l %d6, %d1 /* Check current state of data line */
beq.s 1f /* and set it as previous-state bit */
bset #8, %d4
1:
move.l %d4, %d1 /* Compute the 'bit derivative', i.e. a value */
lsr.l #1, %d1 /* with 1's where the data changes from the */
eor.l %d1, %d4 /* previous state, and 0's where it doesn't */
swap %d4 /* Shift data to upper byte */
lsl.l #8, %d4
move.l (%a0),%d1 /* Get current state of clock port */
move.l %d1, %d2 /* Precalculate opposite state of clock line */
eor.l #CLOCK_MASK, %d2
lsl.l #1, %d4 /* Invert data line for bit7 ? */
bcc.s 1f /* no: skip */
eor.l %d6, %d0 /* invert data bit */
move.l %d0, (%a1) /* output data bit7 */
nop
Fix FS #8840 for irivers by slowing down the driver some more. Signal quality is obviously varying a lot among the iriver remotes. Speed is now around halfway between pre-r16832 and r17006 when boosted. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17657 a1c6a512-1295-4272-9138-f99709370657
2008-05-29 21:41:47 +00:00
nop
Iriver remote LCD driver: * Split out assembler parts. * Reintroduced the 2 transfer routine variants (low/high CPU clock), and made the version for high CPU clock a little slower because there were problems reported. The function can be slowed down more if there are still problems. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17006 a1c6a512-1295-4272-9138-f99709370657
2008-04-06 23:57:37 +00:00
1:
.macro bit_out
Fix FS #8840 for irivers by slowing down the driver some more. Signal quality is obviously varying a lot among the iriver remotes. Speed is now around halfway between pre-r16832 and r17006 when boosted. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17657 a1c6a512-1295-4272-9138-f99709370657
2008-05-29 21:41:47 +00:00
move.l %d2, (%a0) /* Bit7: set CLK = 1 */
nop
Iriver remote LCD driver: * Split out assembler parts. * Reintroduced the 2 transfer routine variants (low/high CPU clock), and made the version for high CPU clock a little slower because there were problems reported. The function can be slowed down more if there are still problems. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17006 a1c6a512-1295-4272-9138-f99709370657
2008-04-06 23:57:37 +00:00
lsl.l #1, %d4 /* Invert data line for bit6 ? */
bcc.s 1f /* no: skip */
eor.l %d6, %d0 /* Invert data bit */
move.l %d1, (%a0) /* set CLK = 0 */
move.l %d0, (%a1) /* Output data bit6 */
Fix FS #8840 for irivers by slowing down the driver some more. Signal quality is obviously varying a lot among the iriver remotes. Speed is now around halfway between pre-r16832 and r17006 when boosted. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17657 a1c6a512-1295-4272-9138-f99709370657
2008-05-29 21:41:47 +00:00
.word 0x51fa /* trapf.w - shadow next insn */
1:
Iriver remote LCD driver: * Split out assembler parts. * Reintroduced the 2 transfer routine variants (low/high CPU clock), and made the version for high CPU clock a little slower because there were problems reported. The function can be slowed down more if there are still problems. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17006 a1c6a512-1295-4272-9138-f99709370657
2008-04-06 23:57:37 +00:00
move.l %d1, (%a0) /* set CLK = 0 */
.endm
Fix FS #8840 for irivers by slowing down the driver some more. Signal quality is obviously varying a lot among the iriver remotes. Speed is now around halfway between pre-r16832 and r17006 when boosted. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17657 a1c6a512-1295-4272-9138-f99709370657
2008-05-29 21:41:47 +00:00
Iriver remote LCD driver: * Split out assembler parts. * Reintroduced the 2 transfer routine variants (low/high CPU clock), and made the version for high CPU clock a little slower because there were problems reported. The function can be slowed down more if there are still problems. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17006 a1c6a512-1295-4272-9138-f99709370657
2008-04-06 23:57:37 +00:00
bit_out
Fix FS #8840 for irivers by slowing down the driver some more. Signal quality is obviously varying a lot among the iriver remotes. Speed is now around halfway between pre-r16832 and r17006 when boosted. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17657 a1c6a512-1295-4272-9138-f99709370657
2008-05-29 21:41:47 +00:00
nop
nop
Iriver remote LCD driver: * Split out assembler parts. * Reintroduced the 2 transfer routine variants (low/high CPU clock), and made the version for high CPU clock a little slower because there were problems reported. The function can be slowed down more if there are still problems. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17006 a1c6a512-1295-4272-9138-f99709370657
2008-04-06 23:57:37 +00:00
bit_out
Fix FS #8840 for irivers by slowing down the driver some more. Signal quality is obviously varying a lot among the iriver remotes. Speed is now around halfway between pre-r16832 and r17006 when boosted. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17657 a1c6a512-1295-4272-9138-f99709370657
2008-05-29 21:41:47 +00:00
nop
nop
Iriver remote LCD driver: * Split out assembler parts. * Reintroduced the 2 transfer routine variants (low/high CPU clock), and made the version for high CPU clock a little slower because there were problems reported. The function can be slowed down more if there are still problems. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17006 a1c6a512-1295-4272-9138-f99709370657
2008-04-06 23:57:37 +00:00
bit_out
Fix FS #8840 for irivers by slowing down the driver some more. Signal quality is obviously varying a lot among the iriver remotes. Speed is now around halfway between pre-r16832 and r17006 when boosted. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17657 a1c6a512-1295-4272-9138-f99709370657
2008-05-29 21:41:47 +00:00
nop
nop
Iriver remote LCD driver: * Split out assembler parts. * Reintroduced the 2 transfer routine variants (low/high CPU clock), and made the version for high CPU clock a little slower because there were problems reported. The function can be slowed down more if there are still problems. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17006 a1c6a512-1295-4272-9138-f99709370657
2008-04-06 23:57:37 +00:00
bit_out
Fix FS #8840 for irivers by slowing down the driver some more. Signal quality is obviously varying a lot among the iriver remotes. Speed is now around halfway between pre-r16832 and r17006 when boosted. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17657 a1c6a512-1295-4272-9138-f99709370657
2008-05-29 21:41:47 +00:00
nop
nop
Iriver remote LCD driver: * Split out assembler parts. * Reintroduced the 2 transfer routine variants (low/high CPU clock), and made the version for high CPU clock a little slower because there were problems reported. The function can be slowed down more if there are still problems. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17006 a1c6a512-1295-4272-9138-f99709370657
2008-04-06 23:57:37 +00:00
bit_out
Fix FS #8840 for irivers by slowing down the driver some more. Signal quality is obviously varying a lot among the iriver remotes. Speed is now around halfway between pre-r16832 and r17006 when boosted. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17657 a1c6a512-1295-4272-9138-f99709370657
2008-05-29 21:41:47 +00:00
nop
nop
Iriver remote LCD driver: * Split out assembler parts. * Reintroduced the 2 transfer routine variants (low/high CPU clock), and made the version for high CPU clock a little slower because there were problems reported. The function can be slowed down more if there are still problems. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17006 a1c6a512-1295-4272-9138-f99709370657
2008-04-06 23:57:37 +00:00
bit_out
Fix FS #8840 for irivers by slowing down the driver some more. Signal quality is obviously varying a lot among the iriver remotes. Speed is now around halfway between pre-r16832 and r17006 when boosted. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17657 a1c6a512-1295-4272-9138-f99709370657
2008-05-29 21:41:47 +00:00
nop
nop
Iriver remote LCD driver: * Split out assembler parts. * Reintroduced the 2 transfer routine variants (low/high CPU clock), and made the version for high CPU clock a little slower because there were problems reported. The function can be slowed down more if there are still problems. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17006 a1c6a512-1295-4272-9138-f99709370657
2008-04-06 23:57:37 +00:00
bit_out
Fix FS #8840 for irivers by slowing down the driver some more. Signal quality is obviously varying a lot among the iriver remotes. Speed is now around halfway between pre-r16832 and r17006 when boosted. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17657 a1c6a512-1295-4272-9138-f99709370657
2008-05-29 21:41:47 +00:00
nop
nop
Iriver remote LCD driver: * Split out assembler parts. * Reintroduced the 2 transfer routine variants (low/high CPU clock), and made the version for high CPU clock a little slower because there were problems reported. The function can be slowed down more if there are still problems. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17006 a1c6a512-1295-4272-9138-f99709370657
2008-04-06 23:57:37 +00:00
move.l %d2, (%a0) /* Bit0: Set CLK = 1 */
Fix FS #8840 for irivers by slowing down the driver some more. Signal quality is obviously varying a lot among the iriver remotes. Speed is now around halfway between pre-r16832 and r17006 when boosted. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17657 a1c6a512-1295-4272-9138-f99709370657
2008-05-29 21:41:47 +00:00
nop
nop
Iriver remote LCD driver: * Split out assembler parts. * Reintroduced the 2 transfer routine variants (low/high CPU clock), and made the version for high CPU clock a little slower because there were problems reported. The function can be slowed down more if there are still problems. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17006 a1c6a512-1295-4272-9138-f99709370657
2008-04-06 23:57:37 +00:00
move.l %d1, (%a0) /* Set CLK = 0 */
move.w %d3, %sr /* Restore interrupt level */
rts
/* Output 8 bits to the LCD as fast as possible. Use only at < 60MHz.
*
* Custom calling convention:
* %a0 - GPIO_OUT_ADDR
* %a1 - GPIO1_OUT_ADDR
* %d4 - data word
* %d6 - DATA_MASK
* Clobbers:
* %d0..%d4
*/
#ifdef HAVE_REMOTE_LCD_TICKING
.write_byte_fast_delayed:
move.l remote_byte_delay, %d0
1:
subq.l #1, %d0
bne.s 1b
#endif
.write_byte_fast:
move.w %sr, %d3 /* Get current interrupt level */
move.w #0x2700,%sr /* Disable interrupts */
move.l (%a1), %d0 /* Get current state of data port */
move.l %d0, %d1
and.l %d6, %d1 /* Check current state of data line */
beq.s 1f /* and set it as previous-state bit */
bset #8, %d4
1:
move.l %d4, %d1 /* Compute the 'bit derivative', i.e. a value */
lsr.l #1, %d1 /* with 1's where the data changes from the */
eor.l %d1, %d4 /* previous state, and 0's where it doesn't */
swap %d4 /* Shift data to upper byte */
lsl.l #8, %d4
move.l (%a0), %d1 /* Get current state of clock port */
move.l %d1, %d2 /* Precalculate opposite state of clock line */
eor.l #CLOCK_MASK, %d2
.macro bit_out_fast
lsl.l #1,%d4 /* Shift out MSB */
bcc.s 1f
eor.l %d6, %d0 /* 1: flip data bit */
move.l %d0, (%a1) /* and output new DATA state */
1:
move.l %d2, (%a0) /* Set CLK */
move.l %d1, (%a0) /* Reset CLK */
.endm
bit_out_fast
bit_out_fast
bit_out_fast
bit_out_fast
bit_out_fast
bit_out_fast
bit_out_fast
bit_out_fast
move.w %d3, %sr /* Restore interrupt level */
rts
.global lcd_remote_write_command
.type lcd_remote_write_command, @function
lcd_remote_write_command:
lea.l (-4*4, %sp), %sp
movem.l %d2-%d4/%d6, (%sp)
move.l (4*4+4, %sp), %d4 /* cmd */
lea.l GPIO_OUT_ADDR, %a0
lea.l GPIO1_OUT_ADDR, %a1
move.l #DATA_MASK, %d6
clr.l remote_cs_countdown
move.l #~RS_MASK, %d0
and.l %d0, (%a0)
moveq.l #~CS_MASK, %d0
and.l %d0, (%a1)
#ifdef HAVE_REMOTE_LCD_TICKING
tst.l remote_byte_delay
ble.s 1f
bsr.w .write_byte_delayed
bra.s 2f
1:
#endif
bsr.w .write_byte
2:
moveq.l #CS_TIMEOUT, %d0
move.l %d0, remote_cs_countdown
movem.l (%sp), %d2-%d4/%d6
lea.l (4*4, %sp), %sp
rts
.global lcd_remote_write_command_ex
.type lcd_remote_write_command_ex, @function
lcd_remote_write_command_ex:
lea.l (-4*4, %sp), %sp
movem.l %d2-%d4/%d6, (%sp)
lea.l GPIO_OUT_ADDR, %a0
lea.l GPIO1_OUT_ADDR, %a1
move.l #DATA_MASK, %d6
clr.l remote_cs_countdown
move.l #~RS_MASK, %d0
and.l %d0, (%a0)
moveq.l #~CS_MASK, %d0
and.l %d0, (%a1)
move.l (4*4+4, %sp), %d4
#ifdef HAVE_REMOTE_LCD_TICKING
tst.l remote_byte_delay
ble.s 1f
bsr.w .write_byte_delayed
move.l (4*4+8, %sp), %d4
bsr.w .write_byte_delayed
bra.s 2f
1:
#endif
bsr.w .write_byte
move.l (4*4+8, %sp), %d4
bsr.w .write_byte
2:
moveq.l #CS_TIMEOUT, %d0
move.l %d0, remote_cs_countdown
movem.l (%sp), %d2-%d4/%d6
lea.l (4*4, %sp), %sp
rts
.global lcd_remote_write_data
.type lcd_remote_write_data, @function
lcd_remote_write_data:
lea.l (-7*4, %sp), %sp
movem.l %d2-%d6/%a2-%a3, (%sp)
move.l (7*4+4, %sp), %a2 /* p_bytes */
move.l (7*4+8, %sp), %d5 /* count */
lea.l GPIO_OUT_ADDR, %a0
lea.l GPIO1_OUT_ADDR, %a1
move.l #DATA_MASK, %d6
lea.l .write_byte, %a3
move.l cpu_frequency, %d0
cmp.l #60000000, %d0
bhi.b 1f
lea.l .write_byte_fast, %a3
1:
#ifdef HAVE_REMOTE_LCD_TICKING
tst.l remote_byte_delay
ble.s 1f
moveq.l #(.write_byte_delayed - .write_byte), %d0
add.l %d0, %a3
1:
#endif
clr.l remote_cs_countdown
move.l #RS_MASK, %d0
or.l %d0, (%a0)
moveq.l #~CS_MASK, %d0
and.l %d0, (%a1)
.wd_loop:
clr.l %d4
move.b (%a2)+, %d4
jsr (%a3)
subq.l #1, %d5
bne.s .wd_loop
moveq.l #CS_TIMEOUT, %d0
move.l %d0, remote_cs_countdown
movem.l (%sp), %d2-%d6/%a2-%a3
lea.l (7*4, %sp), %sp
rts
Reference in a new issue Copy permalink